Pixel-Level Digital-to-Analog Conversion Scheme for Compact Data Drivers of Active Matrix Organic Light-Emitting Diodes with Low-Temperature Polycrystalline Silicon Thin-Film Transistors
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概要
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This paper shows that a part of a digital-to-analog conversion (DAC) function can be included in a pixel circuit to save the circuit area of an integrated data driver fabricated with low-temperature polycrystalline silicon thin-film transistors (LTPS-TFTs). Because the pixel-level DAC can be constructed by two TFTs and one small capacitor, the pixel circuit does not become markedly complex. The design of an 8-bit DAC, which combines a 6-bit resistor-string-based DAC and a 2-bit pixel-level DAC for a 4-in. diagonal VGA format active matrix organic light-emitting diode (AMOLED), is shown in detail. In addition, analysis results are presented, revealing that the 8-bit DAC scheme including a 2-bit pixel-level DAC with $1:3$ demultiplexing can be applied to very high video formats, such as XGA, for a 3 to 4-in. diagonal AMOLED. Even for a 9- to 12-in. diagonal AMOLED, the proposed scheme can still be applied to the XGA format, even though no demultiplexing is allowed. The total height of the proposed 8-bit DAC is approximately 960 μm, which is almost one-half of that of the previous 6-bit resistor-string-based DAC.
- 2010-03-25
著者
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Choi Byong-Deok
Department of Electronic Engineering, Hanyang University, Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea
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Kim Tae-Wook
Department of Electronic Engineering, Hanyang University, Seoul 133-791, Korea
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Tae-Wook Kim
Department of Electronics and Computer Engineering, Hanyang University, Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea
関連論文
- Charge Transport through Molecular Wires and Inorganic Nanowires
- Pixel-Level Digital-to-Analog Conversion Scheme with Compensation of Thin-Film-Transistor Variations for Compact Integrated Data Drivers of Active Matrix Organic Light Emitting Diodes
- Decoder-Type Gate Driver Circuits Fabricated with Amorphous Silicon Thin-Film Transistors for Active Matrix Displays
- Pixel-Level Digital-to-Analog Conversion Scheme for Compact Data Drivers of Active Matrix Organic Light-Emitting Diodes with Low-Temperature Polycrystalline Silicon Thin-Film Transistors
- An 8-bit Data Driving Scheme Based on Two-Step Digital-to-Analog Conversion for Integrated Data Drivers of Active-Matrix Organic Light-Emitting Diodes (Special Issue : Active-Matrix Flatpanel Displays and Devices : TFT Technologies and FPD Materials)
- Nano-Scale Memory Characteristics of Silicon Nitride Charge Trapping Layer with Silicon Nanocrystals
- Compact Decoder-Type Gate Driver Circuits with Hydrogenated Amorphous Silicon Thin Film Transistors for Active Matrix Displays